Flexible PCB Waveform Structure for Vibration Resistance

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Solution Overview

Problem

Conventional flexible printed circuit boards lack effective protection and buffering against external forces, leading to potential breakage and defects in conductive layers, especially when subjected to vibrations and deformations during use in display devices.

Innovation Solution

Incorporating a waveform structure on the cross-section of the flexible printed circuit board, which can be designed according to the applied force, providing a buffer and protection mechanism by extending and deforming to absorb external forces, and optionally covered with a protection layer to enhance durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a planar flexible printed circuit board is used, then the device structure is simple and easy to manufacture, but the board cannot effectively buffer external forces leading to conductive layer breakage

Engineering Contradiction:

Improvebreakage resistanceVSAvoidstructure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent applies curvature by transforming the flat cross-section of the flexible printed circuit board into a waveform structure with alternating peaks and valleys. This curved geometry allows the board to better absorb and distribute external forces, preventing conductive layer breakage while maintaining manufacturing feasibility through standard lamination processes.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent changes the geometric parameters of the flexible printed circuit board by introducing waveform structures with specific amplitude and wavelength. These parameter modifications enable the board to achieve optimal buffering performance against external forces, significantly improving breakage resistance without overly complicating the manufacturing process.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the flexible printed circuit board is repeatedly bent, then the device adapts to flexible display requirements, but defects occur reducing quality and lifetime

Engineering Contradiction:

Improveflexibility adaptabilityVSAvoiddefect rate

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The waveform structure with its curved geometry naturally accommodates bending movements, allowing the flexible printed circuit board to repeatedly bend and flex without causing conductive layer defects. The curved peaks and valleys distribute stress during bending, maintaining reliability while enabling flexible display adaptability.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The waveform structure acts as a pre-designed cushioning mechanism that absorbs external forces and bending stresses before they can damage the conductive layer. This beforehand cushioning protects the board during repeated bending operations, reducing defect rates and extending device lifetime.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If a planar flexible printed circuit board is used, then manufacturing is straightforward, but the board does not provide effective protection against vibration and deformation

Engineering Contradiction:

Improveprotection capabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The waveform structure provides enhanced protection against vibration and deformation through its curved geometry, which naturally dissipates mechanical energy. Despite this improved protection capability, the structure can be manufactured using standard lamination and etching processes, maintaining reasonable ease of manufacture.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

By optimizing the waveform parameters (amplitude, wavelength, and depth), the patent achieves effective protection against vibration and deformation while keeping the manufacturing process within acceptable complexity levels. The parameter optimization ensures that the protective function is achieved without requiring overly complex manufacturing steps.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The waveform structure significantly enhances the breakage resistance and adaptability of the flexible printed circuit board, improving its ability to withstand bending and external forces, as demonstrated by a 300% increase in bending resistance and reduced defect rates in anti-bending tests.

Implementation Method 1

providing a buffer and protection mechanism by extending and deforming to absorb external forces

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS10231326B2Flexible print circuit board and display device

Publication Date: 2019.03.12 BOE TECHNOLOGY GROUP CO LTD

AI summary

A flexible printed circuit board and a display device are disclosed by embodiments of the invention. The flexible printed circuit board has one or more waveform structures disposed on its cross section.